From: Alexey Tourbin via Libc-alpha <libc-alpha@sourceware.org>
Cc: libc-alpha@sourceware.org
Subject: Re: [PATCH] x86-64: Add Avoid_Short_Distance_REP_MOVSB
Date: Sat, 28 Aug 2021 03:27:59 +0300 [thread overview]
Message-ID: <CA+qzen=Th5h3TyeTPza3whXbeWobY+mHZvBGC=qHWXLtukXCzg@mail.gmail.com> (raw)
In-Reply-To: <20210726120055.1089971-1-hjl.tools@gmail.com>
On Mon, Jul 26, 2021 at 3:03 PM H.J. Lu via Libc-alpha
<libc-alpha@sourceware.org> wrote:
> --- a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
> +++ b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
> @@ -325,12 +325,16 @@ L(movsb):
> /* Avoid slow backward REP MOVSB. */
> jb L(more_8x_vec_backward)
> # if AVOID_SHORT_DISTANCE_REP_MOVSB
> + andl $X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip)
> + jz 3f
> movq %rdi, %rcx
> subq %rsi, %rcx
> jmp 2f
> # endif
> 1:
> # if AVOID_SHORT_DISTANCE_REP_MOVSB
> + andl $X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip)
> + jz 3f
> movq %rsi, %rcx
> subq %rdi, %rcx
> 2:
Why "andl" rather than "testl"?
next prev parent reply other threads:[~2021-08-28 0:28 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-26 12:00 [PATCH] x86-64: Add Avoid_Short_Distance_REP_MOVSB H.J. Lu via Libc-alpha
2021-07-26 17:20 ` Noah Goldstein via Libc-alpha
2021-07-26 18:50 ` H.J. Lu via Libc-alpha
2021-07-27 2:15 ` Carlos O'Donell via Libc-alpha
2021-07-27 3:11 ` H.J. Lu via Libc-alpha
2021-07-27 4:05 ` Noah Goldstein via Libc-alpha
2021-07-27 16:05 ` [PATCH v2] " H.J. Lu via Libc-alpha
2021-07-27 19:12 ` Noah Goldstein via Libc-alpha
2021-07-27 19:22 ` [PATCH v3] " H.J. Lu via Libc-alpha
2021-07-27 19:50 ` Noah Goldstein via Libc-alpha
2021-07-27 19:55 ` H.J. Lu via Libc-alpha
2021-07-28 15:08 ` H.J. Lu via Libc-alpha
2021-08-28 0:27 ` Alexey Tourbin via Libc-alpha [this message]
2021-08-28 2:57 ` [PATCH] " Noah Goldstein via Libc-alpha
2022-04-28 0:15 ` Sunil Pandey via Libc-alpha
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